Performance comparison between DS-CDMA IVC using SIC and CSMA/OFDM IVC under dense traffic situation

In the current inter-vehicle communication (IVC) systems such as IEEE802.11p, the CSMA/CA scheme for the MAC scheme and the OFDM for the modulation scheme are most commonly used for the media access scheme and the modulation scheme respectively. These systems are assumed to be used in the application such as safety driving assistance, reducing traffic congestions and so on. On the other hand, since the required application in ITS must cover various field, development of the inter-vehicle communication scheme that has different characteristics from IEEE802.11p for high speed and large capacity data transmission is required for new applications such short range ad hoc network without base stations. In this paper, a new DS-CDMA IVC system using successive interference canceller (SIC) is proposed and its performance is compared with the CSMA/OFDM IVC. As the result of simulation, in the broad cast based wide range IVC, the CSMA/OFDM system can achieve better packet error rate (PER) performance than the proposed DS-CDMA IVC system. On the other hand, it was confirmed that the proposed DS-CDMA IVC system has better packet error rate performance with short latencies in the short range IVC where many short packets are exchange between vehicles.